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Old 30th September 2012, 08:10 PM   #1191
sonnya is offline sonnya  Denmark
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Or even more fun. What if it could be a single cfb opamp dropin??
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Old 1st October 2012, 08:14 AM   #1192
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Quote:
Originally Posted by sonnya View Post
I am thinking of doing a 2 stage tssa preamp.

What should max gain be ? 6 or 12 dB??!
Make both, jumper selectable.

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Originally Posted by sonnya View Post
Or even more fun. What if it could be a single cfb opamp dropin??
What? You'll compete with Bursons?
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Old 1st October 2012, 08:36 AM   #1193
sonnya is offline sonnya  Denmark
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Originally Posted by Lazy Cat View Post
Make both, jumper selectable.


What? You'll compete with Bursons?
I do not think Bursons sell them any more!?

By the way, i have made one before and it works very well besides of the offset in the PMBFJ620 which i did not see come....

Jfet folded cascode with diamond buffer opamp

With a little luck i can make a 2 stage CFB in the same space.
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Old 1st October 2012, 08:45 AM   #1194
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I do not think Bursons sell them any more!?

By the way, i have made one before and it works very well besides of the offset in the PMBFJ620 which i did not see come....

Jfet folded cascode with diamond buffer opamp

With a little luck i can make a 2 stage CFB in the same space.
WOW I didn't know what you did already. Amazing.

I would be the first to order few of these CFB OP amps.
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Old 1st October 2012, 08:57 AM   #1195
Salas is offline Salas  Greece
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Sonny is our miniaturization wiz. Indispensable skills in new age electronics. We will end up with stereoscopes sooner or later to make a simple mod with the rate parts are shrinking.
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Old 1st October 2012, 09:03 AM   #1196
sonnya is offline sonnya  Denmark
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Some quick calculations tell me that it will not be as compact as the "discrete opamp" i already have made.

I need to use SOT-223 package for the output devices.
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Old 1st October 2012, 09:23 AM   #1197
sonnya is offline sonnya  Denmark
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It suffers the same problem as TSSA V1.6 -> high zout of ~60Ohm.

but 2Vpp input, 6dB gain and Load of 1K will give you 3,67Vpp out with THD of 0.000323% thd..

I do not think it is bad. See attachment...
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File Type: pdf cfb v20 opamp 011012 fft.pdf (166.4 KB, 106 views)
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Old 1st October 2012, 09:58 AM   #1198
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Originally Posted by sonnya View Post
It suffers the same problem as TSSA V1.6 -> high zout of ~60Ohm.
but 2Vpp input, 6dB gain and Load of 1K will give you 3,67Vpp out with THD of 0.000323% thd..
I do not think it is bad. See attachment...
So, it looks OK for a 10K load, witch respond at most frequent requirement in a preamp ?
And, as output stage in a preamp has to be an overkiller low Z headphone amp, for it can drive any capacitive load, easy to add a single buffer with discreet transistors, don't you think ?
What about the PSRR ? (I love the Nightly maintenance pictures :-)
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Last edited by Esperado; 1st October 2012 at 10:09 AM.
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Old 1st October 2012, 11:02 AM   #1199
sonnya is offline sonnya  Denmark
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Originally Posted by Esperado View Post
So, it looks OK for a 10K load, witch respond at most frequent requirement in a preamp ?
And, as output stage in a preamp has to be an overkiller low Z headphone amp, for it can drive any capacitive load, easy to add a single buffer with discreet transistors, don't you think ?
What about the PSRR ? (I love the Nightly maintenance pictures :-)
I think the PSRR is okay.

Distortion into 10K is a little higher but better roll off.
Attached Files
File Type: pdf cfb v20 opamp 011012 1KHz fft 10K load.pdf (152.6 KB, 41 views)
File Type: pdf cfb v20 opamp psrr V-.pdf (130.5 KB, 32 views)
File Type: pdf cfb v20 opamp psrr V+.pdf (128.7 KB, 29 views)
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Old 1st October 2012, 11:08 AM   #1200
Jay is offline Jay  Indonesia
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Suitable for headphone amp.
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